Family and friends took to social media Monday and Tuesday to remember the teen — a son, brother and uncle — and offer condolences. His sister wondered in a post how someone could shoot her young brother, who she said never did anyone any harm.

"Please pray for our family," she wrote. "My heart is torn."

Robinson is one of two teenagers killed by gunfire in Milwaukee this year. In February, 14-year-old Chrisima Murry was fatally shot during a fight near N. 50th St. and W. Fairmount Ave. Police have not made any arrests in her homicide.

Ashley Luthern of the Journal Sentinel staff contributed to this report.